8502-BI-DP I/O module

Description

The 8502-BI-DP Bus Interface Module (BIM) provides the
communications link between the 8000 series I/O modules and a
Profibus-DP host. Its high speed acquisition of data from the modules
and LAN operation speeds of up to 6 Mbaud allows the host to
respond rapidly to conditions in the control process.
The BIM gathers the data from the I/O modules and makes it
available to the host upon request. It is a slave to the Profibus master.
As well as cyclic data exchange, which is required for reading input
and writing output data, the BIM supports Profibus Extended
Diagnostics for status information. It also supports a number of
special features which have been implemented to allow high
integrity system operation and in-situ maintenance.
PARAMETERISATION
The 8502 supports parameterisation from the Profibus master. This
configures on a “per module” basis, i.e. all the channels on a single
module carry the same configuration. The configuration is created in
a Profibus configurator using details provided in a GSD file.
This method is fast and enables a configuration to be built based
upon “logical” modules which represent the physical modules.
Modules are added one at a time to the configuration and
parameters are chosen to apply to all the channels of the module.
Logical modules can be selected to provide HART status and process
variables in the Profibus-DP cyclic input telegram. In addition, for
applications where access to many HART variables is required, the
HART “mailbox” can be used. This technique collects HART variable
as they are required; saving space in telegrams that are sometimes
overworked with data. This method is available only when using
parameterisation.
The configuration is passed down from the Profibus master to the BIM
at the start of the session. If the system is stopped and re-started, the
configuration file is re-transmitted to the BIM

8502-BI-DP